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# Introduction to Groups and Geometries (Lyons)

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This text is two textbooks in one: an introduction to group theory, and an introduction to modern geometries using the Kleinian paradigm. The book can be used for a combined one-semester course in both subjects, or, through supplementary projects, it can be used for a one-semester introduction to group theory or a one-semester introduction to modern geometries.

Thumbnail: A triangle immersed in a saddle-shape plane (a hyperbolic paraboloid), along with two diverging ultra-parallel lines. (Public Domain; LucasVB via Wikipedia)

This page titled Introduction to Groups and Geometries (Lyons) is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by David W. Lyons via source content that was edited to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.

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